Hi - I am new to these forums so I hope this is the right place for this. I downloaded an image of a web template to look at the colours more closely before possibly purchasing it and when I opened the image in CS4 it had a bunch of triangular blocked out areas - kind of like a mask of some sort I think. I then tried creating a new document and opening an existing, unrelated PSD file and now they have the same triangular blocked out areas. Help please!!!

Sorry for the delay - I tried uninstalling and reinstalling without success... I also opened a different pre-existing .PSD and it had a different display issue than this one. The image below is from a new document creation, but the same pattern still showed up in a document that I had initially opened.

Thank you. I thought my drivers were up-to-date actually since I just added a second monitor and had done an update. It never occurred to me that this display issue in Photoshop was the first time since adding the second monitor. Cheers...